1950  3075
1951  2926
1952  3292
1953  3210
1954  3058
1955  3220
1956  3445
1957  3400
1958  3725
1959  4197 
1960  4314
1961  3598
1962  3606
1963  4019
1964  3484
1965  4084
1966  4117
1967  4760
1968  4450
1969  4687
1970  4152
1971  5646
1972  5580
1973  5671
1974  4701
1975  5841
1976  6289
1977  6505
1978  7268
1979  7928
1980  6639
1981  8119
1982  8235
1983  4175
1984  7674
1985  8865
1986  8253